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Doctor Who
Season 1
Episode 21

The Sea of Death

April 11, 1964

68.0%

Doctor Who - S1 - E21

The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

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Doctor Who: Season 1 - 42 Episode s

1x1 - An Unearthly Child
November 23, 1963
After discussing a strange pupil, Susan Foreman, teachers Ian and Barbara follow her to a junkyard. They meet her grandfather, the Doctor, and force their way inside a police box with frightening results.
1x2 - The Cave of Skulls
November 30, 1963
The enigmatic Doctor, afraid that schoolteachers Ian Chesterton and Barbara Wright will reveal his secrets to the people of 20th century Earth, has taken them and his granddaughter Susan back to the dawn of human history. There, the four travellers are dragged into the savage politics of a tribe of cavemen who have lost the secret of making fire…
1x3 - The Forest of Fear
December 7, 1963
Prisoners of the earliest humans, the TARDIS crew are caught in a deadly power play for leadership of the tribe.
1x4 - The Firemaker
December 14, 1963
The TARDIS crew must make fire for the early humans to stay alive. But once they do, they may not be allowed to leave!
1x5 - The Dead Planet
December 21, 1963
Time Unknown, Planet Unknown. The TARDIS lands in an eerie petrified forest overlooking a magnificent steel city. The Doctor wants to explore the city – but what is waiting there?
1x6 - The Survivors
December 28, 1963
The dead planet is not uninhabited after all. The Doctor is about to meet what will become his greatest enemies. And he and his crew are dying of radiation sickness.
1x7 - The Escape
January 4, 1964
Imprisoned on Skaro by the scheming Daleks, the Doctor and his companions work to escape their clutches.
1x8 - The Ambush
January 11, 1964
The time travellers work desperately to both escape the Dalek city and prevent a bloody massacre.
1x9 - The Expedition
January 18, 1964
The time travellers have escaped from the Daleks, but left a vital piece of the TARDIS behind. Getting it back will mean pushing the Thals to mount a dangerous operation.
1x10 - The Ordeal
January 25, 1964
Ian, Barbara and the Thals struggle through the caves to reach the Dalek city. Will they get there in time? Is there even a way through the treacherous caves? And what are the Daleks planning?
1x11 - The Rescue
February 1, 1964
Time is running out as the Doctor and his companions try to defeat the Daleks before they wipe out all life on Skaro.
1x12 - The Edge of Destruction
February 8, 1964
A mysterious explosion has knocked the TARDIS into void. And in their confusion, the crew are turning on one another.
1x13 - The Brink of Disaster
February 15, 1964
The TARDIS is adrift, the crew turning on each other. Only by working together can they find their way out before they are destroyed.
1x14 - The Roof of the World
February 22, 1964
The TARDIS experiences a total power failure and is stranded in the Himalayas in the 13th century. The travellers are forced to join the caravan of the famous explorer, Marco Polo, in order to survive -- but Polo, fascinated by their claims that the TARDIS can fly through the air, seizes it on behalf of Kublai Khan in the hope that presenting the Khan with such a fabulous gift will convince him to let Polo return home to Venice. The travellers are forced to accompany Polo on his long trek across Asia to the Khan's court, but their many attempts to reclaim their property are foiled -- not just by Polo, but by the war lord Tegana, who is apparently on a mission of peace but has entirely different plans for dealing with Kublai Khan...
1x15 - The Singing Sands
February 29, 1964
Tegana sabotages the party's water bags, leaving them in dire need of fresh supplies.
1x16 - Five Hundred Eyes
March 7, 1964
The Doctor and Susan are able to supply Marco with condensation that has formed inside the TARDIS, saving the group from dying of thirst. When the group are reunited with Tegana, the travellers begin to suspect he is up to something.
1x17 - The Wall of Lies
March 14, 1964
The Doctor's group manage to rescue Barbara from the Mongols but once more Marco remains unaware of Tegana's involvement.
1x18 - Rider from Shang Tu
March 21, 1964
The Doctor and his friends elect to warn Marco of Acomat's attack even though it means losing their chance to gain access to the TARDIS.
1x19 - Mighty Kublai Khan
March 28, 1964
The Doctor, Ian and Barbara are forced to surrender to Tegana and Marco, leaving both of them the opportunity to gain possession of the TARDIS.
1x20 - Assassin at Peking
April 4, 1964
Tegana finally makes his move to assassinate the Khan, giving the Doctor and his friends an opportunity to thwart his plans and regain the TARDIS.
1x21 - The Sea of Death
April 11, 1964
The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...
1x22 - The Velvet Web
April 18, 1964
The Doctor and his friends arrive in the apparently idyllic city of Morphoton but Barbara soon begins to realise there is more to their hosts than meets the eye.
1x23 - The Screaming Jungle
April 25, 1964
The search for the second key takes the travellers to a jungle where Ian and Barbara come under threat from rapidly growing plants.
1x24 - The Snows of Terror
May 2, 1964
Searching for the third key, Ian and Barbara meet with the sinister trapper Vasor before following Susan and the others into a cave system guarded by the mysterious Ice Soldiers.
1x25 - Sentence of Death
May 9, 1964
The group are reunited with the Doctor in the city of Millennius where Ian faces trial for murder after the fourth key is stolen.
1x26 - The Keys of Marinus
May 16, 1964
The Doctor and his friends must locate the real murderers and the fourth key before heading off for a final confrontation with the Voord
1x27 - The Temple of Evil
May 23, 1964
The TARDIS arrives on Earth landing in 16th century Aztec society. Barbara goes off exploring - despite the Doctor's orders not to wander off - and is taken away by the high priest Autloc who believes she is the reincarnation of the goddess Yetaxa. They believe it is a sign that the rains - which are late - will now come. The high priest of sacrifice Tlotoxl recruits Ian to lead their army but he finds he has a rival in Ixta. Ian is less than comfortable with his role when he learns that they are to deliver the human sacrifice to the high priest at the rain ceremony. The Doctor emphasizes that they must not interfere with Aztec rituals, something that does not sit well with Barbara.
1x28 - The Warriors of Death
May 30, 1964
Barbara tries to change the course of history - and Ian fights for his life.
1x29 - The Bride of Sacrifice
June 6, 1964
While the Doctor tries to find a way back to the TARDIS, Tlotoxl continues to plot Barbara's downfall and sees an opening when Susan questions Aztec custom.
1x30 - The Day of Darkness
June 13, 1964
Tlotoxl's machinations result in both Susan and Ian being arrested. With the TARDIS once again trapped inside the tomb, the travellers' only hope for escape lies with Autloc and Cameca.
1x31 - Strangers in Space
June 20, 1964
The 28th century. The TARDIS materialises on a spaceship orbiting a planet known as the Sense-Sphere, whose natives, the Sensorites, have trapped the ship's human crew in a state of paralysis.
1x32 - The Unwilling Warriors
June 27, 1964
The Doctor and his companions are on board an Earth ship trapped in orbit around the Sense-Sphere when it is boarded by the Sensorites, who steal the lock mechanism from the TARDIS.
1x33 - Hidden Danger
July 11, 1964
The Doctor and his companions are escorted to the Sense-Sphere where they attempt to negotiate with the Sensorites for the release of the TARDIS.
1x34 - A Race Against Death
July 18, 1964
With Ian having fallen victim to the Sensorites' plague, the Doctor is desperate to find a cure. But the City Administrator is still determined to rid his world of aliens.
1x35 - Kidnap
July 25, 1964
The City Administrator is determined to destroy the Doctor and his friends and his paranoia prevents the Doctor's cure from being distributed.
1x36 - A Desperate Venture
August 1, 1964
While the City Administrator's schemes reach their climax, the Doctor and Ian venture into the tunnels under the city to discover the real cause of the Sensorite plague.
1x37 - A Land of Fear
August 8, 1964
The TARDIS lands during the French Revolution, where Ian, Barbara, and Susan become caught up in the politics of the day. When they are arrested and set to be executed, the Doctor must take on the disguise of a public official to try and save their lives.
1x38 - Guests of Madame Guillotine
August 15, 1964
Susan, Ian and Barbara are sentenced to be guillotined but an encounter with a dying English prisoner may offer Ian a chance of survival.
1x39 - A Change of Identity
August 22, 1964
Susan and Barbara are rescued by Jules and Jean, two members of the escape chain, while the Doctor gains access to the prison by posing as a revolution official.
1x40 - The Tyrant of France
August 29, 1964
The Doctor is forced into a meeting with Robespierre while Barbara's attempts to find a physician for Susan result in them being betrayed.
1x41 - A Bargain of Necessity
September 5, 1964
Ian finds himself held prisoner by the treacherous Leon while the Doctor attempts to engineer Susan and Barbara's escape.
1x42 - Prisoners of Conciergerie
September 12, 1964
Ian finally delivers his message to James Stirling but in order to secure Susan's release he and Barbara are forced into a dangerous spying mission.

1x1 - An Unearthly Child

1x2 - The Cave of Skulls

1x3 - The Forest of Fear

1x4 - The Firemaker

1x5 - The Dead Planet

1x6 - The Survivors

1x7 - The Escape

1x8 - The Ambush

1x9 - The Expedition

1x10 - The Ordeal

1x11 - The Rescue

1x12 - The Edge of Destruction

1x13 - The Brink of Disaster

1x14 - The Roof of the World

1x15 - The Singing Sands

1x16 - Five Hundred Eyes

1x17 - The Wall of Lies

1x18 - Rider from Shang Tu

1x19 - Mighty Kublai Khan

1x20 - Assassin at Peking

1x21 - The Sea of Death

1x22 - The Velvet Web

1x23 - The Screaming Jungle

1x24 - The Snows of Terror

1x25 - Sentence of Death

1x26 - The Keys of Marinus

1x27 - The Temple of Evil

1x28 - The Warriors of Death

1x29 - The Bride of Sacrifice

1x30 - The Day of Darkness

1x31 - Strangers in Space

1x32 - The Unwilling Warriors

1x33 - Hidden Danger

1x34 - A Race Against Death

1x35 - Kidnap

1x36 - A Desperate Venture

1x37 - A Land of Fear

1x38 - Guests of Madame Guillotine

1x39 - A Change of Identity

1x40 - The Tyrant of France

1x41 - A Bargain of Necessity

1x42 - Prisoners of Conciergerie

S0: Specials

S1: Season 1

S2: Season 2

S3: Season 3

S4: Season 4

S5: Season 5

S6: Season 6

S7: Season 7

S8: Season 8

S9: Season 9

S10: Season 10

S11: Season 11

S12: Season 12

S13: Season 13

S14: Season 14

S15: Season 15

S16: The Key to Time

S17: Season 17

S18: Season 18

S19: Season 19

S20: Season 20

S21: Season 21

S22: Season 22

S23: The Trial of a Time Lord

S24: Season 24

S25: Season 25

S26: Season 26